Question

使用phonegap下载文件时，当互联网关闭时 - 应用程序挂起并崩溃。我收到以下错误：

*由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：' - [__ NSCFDictionary setObject：forKey：]：尝试插入nil值（键：body）' * 第一次抛出调用堆栈：（0x35b4c88f 0x33770259 0x35b4c789 0x35b4c7ab 0x35ab968b 0x56a7f 0x57f8d 0x34f9dc29 0x34ef56d9 0x34ef56a3 0x34f9ddfb 0x3189dcb5 0x318034b7 0x318031a3 0x318030d9 0x35b20ad3 0x35b20335 0x35b1f045 0x35aa24a5 0x35aa236d 0x3383d439 0x3327acd5 0x28d9f 0x28d60）终止调用抛出异常（lldb）

下载文件的逻辑：

if(isOnline){
            //  alert("DEVICE is ONLINE" + isOnline);
            try{
                filePath = globalPathNew + "/" +name+ "."+fExt;
                //     alert("SAVING VIDEO AT ------> " + filePath);


                document.getElementById('PB'+name).style.display = 'block';

                document.getElementById('P'+name+'L').innerHTML = '';

                document.getElementById('P'+name+'L').innerHTML = 'Downloading...';





                ftv.onprogress = function(progressEvent) {
                    console.log("In Progress video"+progressEvent.lengthComputable);
                    if (progressEvent.lengthComputable) {
                        //downloadcompleteStatus =  Math.round(100 * (progressEvent.loaded / progressEvent.total));
                        $("#P" + name + "Progress").text(Math.round(100 * (progressEvent.loaded / progressEvent.total)) + "%");
                        console.log("------progressEvent if video------->%"+Math.round(100 * (progressEvent.loaded / progressEvent.total)));
                    } else {
                        console.log("------progressEvent else------->%"+Math.round(100 * (progressEvent.loaded / progressEvent.total)));

                    }
                };


                fileObjAbort = ftv;
                //alert("Video FileObj"+JSON.stringify(fileObjAbort));

                ftv.download(
                             url,
                             filePath,
                             function(entry) {

                             // alert("download complete: " + entry.fullPath);
                             //                                      console.log('video entry.fullPath------'+entry.fullPath);
                             //                                      console.log('video filePath ----'+filePath);

                             changeIsdownloadStatus(filePath, name, 'video');

                             if(currElementId != '' && currElementId != '' && currElementId != ''){
                             detailPageView(currElementId,currElementtype,currElementcountNum);
                             }
                             var index = -1;

                             $.each(downloadList, function(key,tempItem){
                                    if(tempItem.elementId == elementId){
                                    index = key;

                                    }
                                    });

                            // alert("dw list"+JSON.stringify(downloadList));
                             if(index != -1){
                             delete downloadList[index];
                             downloadList.splice(index,1);
                             }
                             //alert("dw list after Video Splice \n"+JSON.stringify(downloadList));
                             findNextDownloadItem(name);


                             //  alert("DOWNLOADED ------> ");
                             if(currDownload == elementId){

                             //changeIsdownloadStatus(filePath,name, 'delete');

                             if(currElementId != '' && currElementId != '' && currElementId != ''){
                             detailPageView(currElementId,currElementtype,currElementcountNum);
                             }

                             }


                             console.log('*********************Video******************************');
                             console.log('-->delete element id:'+elementId);
                             console.log('deleteProgressindex Position:'+index);
                             console.log('-->before delete Length Array :'+downloadList.length);

                             console.log('-->before delete Length Array :'+downloadList.length);
                             console.log('***************************************************');


                             //                                      playMedia(filePath, name,'video');


                             // Code added
                           //bhavya  getFileSystemRefForWriting(jsonData);

                             deleteProgress(name,elementTitle,isDownloadedFlag,elementAudio,val,filePath);
                             // Code added
                             // getFileSystemRefForWriting(jsonData);

                             },
                             function(error) {
                             if(error.code != 4 || error.code != '4'){
                             //alert("Download Error");

                             jAlert('Download was not completed due to lost internet connection. Please connect to the Internet and re-download.', 'TT');
                             console.log("download error" + error.source);
                             //                                      console.log("download error source " + error.source);
                             //                                      console.log("download error target " + error.target);
                             //                                      console.log("upload error code" + error.code);
                             }
                             }
                             );

            }
            catch(error)
            {
                var txt="There was an error on this page.\n\n";
                txt+="Error description: " + err.message + "\n\n";
                txt+="Click OK to continue.\n\n";
                console.log('in catch block of video------>>>>'+txt);
            }


        }else{
            jAlert('Please go online to download file.', 'TT');
        }

当我从互联网断开连接时，我会收到以下错误：由于互联网连接丢失，下载尚未完成。请连接到互联网并重新下载。

当互联网关闭时，切换到objective-c是在 main.m 文件中进行的，它会卡在此行：

retVal为0.并且它不执行NSLog行。

#import <UIKit/UIKit.h>

int main(int argc, char* argv[])
{
    @autoreleasepool {
        **int retVal = UIApplicationMain(argc, argv, nil, @"AppDelegate");**

        NSLog(@"RETURN VALUE ----->: %d ", retVal);

        return retVal;
    }
}

有人可以提出可能的原因吗？

谢谢， Ankit Tanna

Answer 1

以下是phonegap 2.5

的修复方法

转到CordovaLib.xcodeproject
导航至：课程＆gt;命令＆gt; CDVFileTransfer.m
转到或搜索以下函数： - （NSMutableDictionary *）createFileTransferError
在 [结果setObject：body forKey：@“body”]之前添加以下行; if（body == nil）body = @“”;
瞧!!!你在那里。

感谢我的同事：）

PS：这些错误和其他几个错误列在Phonegap for iOS的Apache页面上。

Answer 2

您不能将nil值设置为字典对象。如果您希望占位符没有值，请使用[NSNull null]，这会创建单例NSNull的实例。它在尝试为键body定义对象时崩溃。如果您有权访问该代码，请尝试try .... catch以阻止其尝试nil，可能是默认值。

没有代码，这只是对该错误消息的猜测。

iOS应用程序在使用Phonegap下载文件时崩溃

2 个答案: